1. Beckerman, Wilfred (1987). ?National income,? inThe New Palgrave: A Dictionary of Economics. London: The Macmillan Press Ltd.
2. Bell, David E. (1986). ?Population policy: Choices for the United States,? in Jane Menken, ed.World Population and U.S. Policy: The Choices Ahead. New York: The American Assembly and W.W. Norton, pp. 207?208.
3. Boserup, Ester (1981).Population and Technological Change. Chicago: University of Chicago Press.
4. Boserup, Ester (1990).Economic and Demographic Relationships in Development. Essays selected and introduced by T. Paul Schultz. Baltimore and London: The Johns Hopkins Press.
5. Davis, Kingsley (1945). ?The world demographic transition,? in Kingley Davis, ed.World Population in Transition. The Annals, Vol. 237. The American Academy of Political and Social Science, pp. 1?11.